The rule of Thai students’ uniform has to be abided by. If not, students will be punished by teachers. This context has been heard since we were young. In each generation, there must be a group of students who regularly breaks this rule. Thus, it is questioned that “why students keep breaking this rule if it is rational”. At the same time, the students who break this rule still wear the uniform, and it does not affect something bad to them. This rule just provides discipline to students.